[Paraview] VRPlugin crashes when loading VR states with interactor styles

[Johannes Zarl]

Hi,

When loading a VR state in the VRPlugin, paraview often crashes if there is a 
VRInteractorStyle defined. The reason for this is that if the proxy/proxyName 
doesn't match anything in the current state, the style cannot be configured. If 
the style is then added to the VRQueueHandler, ParaView crashes.

The attached patch fixes the crash.

Cheers,
  Johannes
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